<template>
    <div class="helper">
        <span class="left">{{unFinishedTodoLength}} items left</span>
        <span class="tabs">
            <span
            v-for="state in states"
            :key="state"
            :class="[state,filter===state ? 'actived' : '']"
            @click="toggleFilter(state)"
            >{{state}}</span>
        </span>
        <span class="clear" @click="clearAllCompleted">Clear All</span>
    </div>
</template>

<script>
    export default {
      name: 'tabs',
      props: {
        filter: {
          type: String,
          required: true
        },
        todos: {
          type: Array,
          required: true
        }
      },
      data () {
        return {
          states: ['all', 'active', 'completed']
        }
      },
      computed: {
        unFinishedTodoLength () {
          return this.todos.filter(todo => !todo.completed).length
        }
      },
      methods: {
        toggleFilter (state) {
          this.$emit('toggle', state)
        },
        clearAllCompleted () {
          console.log('clear')
        }
      }
    }
</script>

<style lang="stylus" scoped>
.helper
    font-weight 100
    display: flex
    justify-content space-between
    padding 5px 0
    line-height 30px
    background-color #fff
    font-size 14px
    font-smoothing antialiased
.left,.clear,.tabs
    padding 0 10px
    box-sizing border-box
.left,.clear
    width 150px
.left
    text-align left
.clear
    text-align right
    cursor pointer
.tabs
    width:200px
    display: flex
    justify-content space-around
    *
        display inline-block
        padding 0 10px
        cursor pointer
        &.actived
            border solid 1px rgba(175,47,47,.4)
            border-color rgba(175,47,47,.4)
            border-radius 5px

</style>